technetium-99m
I too was able to do most everything on my little micro-lux. I had no problem doing sight mounts, fitting slides, done a few high power cuts and ball mill cuts. Cutting Cold style serrations was no problem. I never liked doing STI style serrations on the machine though because mine always looked a ouch ragged. With patience these little mills can do a lot. The point I was trying to make is that if you choose a little mill the cost of the actual mill soon becomes forgotten; when you have $3000 invested in rotary table, vices, cutting tools, arbors, measuring tools, etc. the difference between a $500 mill and a &1000 don't seem so big. I sold my little mill for the same price I bought it for and put the money into a bigger machine. Setting up is much easier on the bigger machine and I don't need to make as many passes.
I would watch Craigslist since I see one or two little mills sell each month. They sell for the same price as new but often include a couple thousand dollars worth of accessories. I bought my little one for $600 but it had a rotary table ($300), vice ($150), face mill ($75), boring head (100), and 200 or so milling bits ($1500?). I eventually sold the mill but came out way ahead on the deal.
Buying a mill is like buying a gun. They seem expensive but hold their value well. If you buy used and sell used you often end up losing nothing.